terminating calls to customers on fixed or mobile networks market.

[LenaK]

В контексте привожу полабзаца, т.к. некая описательность присутствует в оном. Затруднительная формулировка - в предпоследнем предложении.

For instance, leased lines revenues, leased capacity or numbers of leased line termination points are possible criteria for measuring an undertaking’s relative strength on leased lines markets. As the
Commission has indicated, the mere number of leased line termination points does not take into account the different types of leased lines that are available on the market – ranging from analogue voice-quality to high-speed digital leased lines, short distance to long distance
international leased lines. Of the two, leased lines revenues may be more transparent and less complicated to measure. Likewise, retail revenues, call minutes or numbers of fixed telephone lines or subscribers of public telephone network operators are possible criteria for measuring the market shares of undertakings operating in these markets. Where the market defined is that of interconnection, a more realistic measurement parameter would be the revenues accrued for terminating calls to customers on fixed or mobile networks. This is so
because the use of revenues, rather than for example call minutes, takes account of the fact that call minutes can have different values (i.e., local, long distance and international) and provides a measure of market presence that reflects both the number of customers and network coverage.

[LenaK]

Что такое interconnection market тоже непонятно.

Вот еще одно предложение с interconnection market

With regard to the interconnection market of fixed and mobile networks, the termination traffic to be measured should include own network traffic and interconnection traffic received from all other fixed
and mobile networks, national or international.